Bellakki, M.B. and Shivakumara, C. and Vasanthacharya, N.Y. and Prakash, A.S. (2010) Rapid synthesis of room temperature ferromagnetic Ag-doped LaMnO3 perovskite phases by the solution combustion method. Materials Research Bulletin, 45. pp. 1685-1691. ISSN 0025-5408

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Abstract

We report the rapid solution combustion synthesis and characterization of Ag-substituted LaMnO3 phases at relatively low temperature using oxalyl dihydrazide, as fuel. Structural parameters were refined by the Rietveld method using powder X-ray diffraction data. While the parent LaMnO3 crystallizes in the orthorhombic structure, the Ag-substituted compounds crystallize in the rhombohedral symmetry. On increasing Ag-content, unit cell volume and Mn–O–Mn bond angle decreases. The Fourier transform infra red spectrumshows two absorption bands corresponding toMn–Ostretching vibration (ns mode) and Mn– O–Mn deformation vibration (nb mode) around 600 cm-1 and 400 cm-1 for the compositions, x = 0.0, 0.05 and 0.10, respectively. Electrical resistivity measurements reveal that composition-controlled metal to insulator transition, with the maximum metal to insulator being 280 K for the composition La0.75Ag0.25MnO3. Increase in magnetic moment was observed with increase in Ag-content. The maximum magnetic moment of 35 emu/g was observed for the composition La0.80Ag0.20MnO3.

Item Type:	Article
Uncontrolled Keywords:	Oxides; X-ray diffraction; Crystal structure;Magnetic properties
Subjects:	Electrochemical Materials Science
Divisions:	UNSPECIFIED
Depositing User:	ttbdar CECRI
Date Deposited:	08 May 2012 06:48
Last Modified:	08 May 2012 06:48
URI:	http://cecri.csircentral.net/id/eprint/532

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